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Hazardous and
non-hazardous waste streams-their residues or solids-are deposited
into secure Resource Conservation and Recovery Act (RCRA) and
Subtitle D landfills. Secure RCRA landfills differ from municipal
or sanitary landfills, which are intended for household and
non-hazardous waste. Unlike most landfills, secure RCRA landfills
are designed for the safe disposal of hazardous waste.
The secure RCRA landfill system consists
of a minimum of two heavy synthetic membranes up to 80 millimeters
thick installed over compacted clay at least five feet in
depth. Cells constructed with multiple liners, leachate collection
systems, and ground monitoring devices protect the surface
and groundwater from contamination. All leachate collected
from the landfill undergoes treatment.
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 Secure
landfill waste is strictly limited to drummed and bulk solids,
pretreated sludges, and incinerator ash that meet all treatment
standards as described in the land disposal restrictions (LDRs).
Waste that does not meet LDR standards must be physically and/or
chemically treated prior to disposal. For example, waste with
free liquids must undergo solidification before deposition.
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